Add comprehensive skills and documentation for various technologies

.claude/skills/devops/docker/SKILL.md

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+# Docker
+
+## Description
+
+Docker containerization including Dockerfiles, compose, and best practices.
+
+## When to Use
+
+- Containerizing applications
+- Local development environments
+- CI/CD pipelines
+
+---
+
+## Core Patterns
+
+### Multi-stage Dockerfile (Node.js)
+
+```dockerfile
+# Build stage
+FROM node:20-alpine AS builder
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+COPY . .
+RUN npm run build
+
+# Production stage
+FROM node:20-alpine
+WORKDIR /app
+COPY --from=builder /app/dist ./dist
+COPY --from=builder /app/node_modules ./node_modules
+EXPOSE 3000
+CMD ["node", "dist/index.js"]
+```
+
+### Python Dockerfile
+
+```dockerfile
+FROM python:3.12-slim
+
+WORKDIR /app
+
+# Install dependencies first (caching)
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+EXPOSE 8000
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0"]
+```
+
+### Docker Compose
+
+```yaml
+version: '3.8'
+
+services:
+  app:
+    build: .
+    ports:
+      - "3000:3000"
+    environment:
+      - DATABASE_URL=postgresql://user:pass@db:5432/app
+    depends_on:
+      - db
+
+  db:
+    image: postgres:16-alpine
+    environment:
+      POSTGRES_USER: user
+      POSTGRES_PASSWORD: pass
+      POSTGRES_DB: app
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+
+volumes:
+  postgres_data:
+```
+
+## Best Practices
+
+1. Use multi-stage builds
+2. Order commands for cache efficiency
+3. Use .dockerignore
+4. Run as non-root user
+5. Use specific image tags
+
+## Common Pitfalls
+
+- **Large images**: Use slim/alpine bases
+- **Cache busting**: Order COPY commands properly
+- **Root user**: Add USER instruction

.claude/skills/devops/github-actions/SKILL.md

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+# GitHub Actions
+
+## Description
+
+GitHub Actions CI/CD workflows including testing, building, and deployment.
+
+## When to Use
+
+- Setting up CI/CD pipelines
+- Automating tests and builds
+- Deployment automation
+
+---
+
+## Core Patterns
+
+### Basic CI Workflow
+
+```yaml
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+      - run: npm ci
+      - run: npm test
+```
+
+### Matrix Builds
+
+```yaml
+jobs:
+  test:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        node: [18, 20]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node }}
+```
+
+### Caching
+
+```yaml
+- uses: actions/cache@v4
+  with:
+    path: ~/.npm
+    key: npm-${{ hashFiles('**/package-lock.json') }}
+    restore-keys: npm-
+```
+
+### Secrets
+
+```yaml
+- name: Deploy
+  env:
+    API_KEY: ${{ secrets.API_KEY }}
+  run: deploy --key "$API_KEY"
+```
+
+## Best Practices
+
+1. Use caching for dependencies
+2. Run jobs in parallel when possible
+3. Use environment secrets
+4. Pin action versions
+5. Add proper triggers
+
+## Common Pitfalls
+
+- **Slow pipelines**: Add caching
+- **Secret exposure**: Never echo secrets
+- **Unpinned versions**: Use @v4 not @main